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This video shows you how to use the FA-DC67a adapter. He is fitting the unit to a SX50 but its just the same for them all.

Canon FA-DC67A Filter Adapter for PowerShot SX30 IS SX40 HS SX50 HS. Used to mount 67mm filters to the lens barrels of the camera
The advantage of this adapter is that it adjusts as you change the zoom angle of the lens. In this way, vignetting (the darkening of the corners in the image) is eliminated.

This Canon FA-DC67A Filter Adapter for PowerShot SX30 IS & SX40 HS & SX50 HS comes with a full warranty in Australia. Cameras Direct since 2003. Pop into our Gold Coast camera store & warehouse or order online. #CamerasDirect, happily helping you take a better #photo and being at your service. Thank you.